Ustwo In Monument Valley, you need to help Princess Ida on a mission by means of Monument Valley -- a world of mazes, crow people and strange, unattainable constructions. If you want this one, the studio has a sequel -- Monument Valley 2 ($5) -- which stands by itself as an authentic story and takes a step forward as a more sophisticated narrative and elegance. The game works like a pinball game: The upper you go, the extra health you lose when you fall out of the ring. Whether or…